From: tip-bot for Dave Hansen <tipbot@zytor.com>
To: linux-tip-commits@vger.kernel.org
Cc: mingo@kernel.org, tglx@linutronix.de, peterz@infradead.org,
torvalds@linux-foundation.org, dave@sr71.net, riel@redhat.com,
dave.hansen@linux.intel.com, akpm@linux-foundation.org,
luto@amacapital.net, hpa@zytor.com, brgerst@gmail.com,
linux-kernel@vger.kernel.org, dvlasenk@redhat.com, bp@alien8.de
Subject: [tip:mm/pkeys] x86/cpufeature, x86/mm/pkeys: Add protection keys related CPUID definitions
Date: Thu, 18 Feb 2016 12:17:09 -0800 [thread overview]
Message-ID: <tip-dfb4a70f20c5b3880da56ee4c9484bdb4e8f1e65@git.kernel.org> (raw)
In-Reply-To: <20160212210201.7714C250@viggo.jf.intel.com>
Commit-ID: dfb4a70f20c5b3880da56ee4c9484bdb4e8f1e65
Gitweb: http://git.kernel.org/tip/dfb4a70f20c5b3880da56ee4c9484bdb4e8f1e65
Author: Dave Hansen <dave.hansen@linux.intel.com>
AuthorDate: Fri, 12 Feb 2016 13:02:01 -0800
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Tue, 16 Feb 2016 10:11:13 +0100
x86/cpufeature, x86/mm/pkeys: Add protection keys related CPUID definitions
There are two CPUID bits for protection keys. One is for whether
the CPU contains the feature, and the other will appear set once
the OS enables protection keys. Specifically:
Bit 04: OSPKE. If 1, OS has set CR4.PKE to enable
Protection keys (and the RDPKRU/WRPKRU instructions)
This is because userspace can not see CR4 contents, but it can
see CPUID contents.
X86_FEATURE_PKU is referred to as "PKU" in the hardware documentation:
CPUID.(EAX=07H,ECX=0H):ECX.PKU [bit 3]
X86_FEATURE_OSPKE is "OSPKU":
CPUID.(EAX=07H,ECX=0H):ECX.OSPKE [bit 4]
These are the first CPU features which need to look at the
ECX word in CPUID leaf 0x7, so this patch also includes
fetching that word in to the cpuinfo->x86_capability[] array.
Add it to the disabled-features mask when its config option is
off. Even though we are not using it here, we also extend the
REQUIRED_MASK_BIT_SET() macro to keep it mirroring the
DISABLED_MASK_BIT_SET() version.
This means that in almost all code, you should use:
cpu_has(c, X86_FEATURE_PKU)
and *not* the CONFIG option.
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Dave Hansen <dave@sr71.net>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: linux-mm@kvack.org
Link: http://lkml.kernel.org/r/20160212210201.7714C250@viggo.jf.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/include/asm/cpufeature.h | 59 +++++++++++++++++++++-----------
arch/x86/include/asm/cpufeatures.h | 2 +-
arch/x86/include/asm/disabled-features.h | 15 ++++++++
arch/x86/include/asm/required-features.h | 7 ++++
arch/x86/kernel/cpu/common.c | 1 +
5 files changed, 63 insertions(+), 21 deletions(-)
diff --git a/arch/x86/include/asm/cpufeature.h b/arch/x86/include/asm/cpufeature.h
index 68e4e82..50e292a 100644
--- a/arch/x86/include/asm/cpufeature.h
+++ b/arch/x86/include/asm/cpufeature.h
@@ -26,6 +26,7 @@ enum cpuid_leafs
CPUID_8000_0008_EBX,
CPUID_6_EAX,
CPUID_8000_000A_EDX,
+ CPUID_7_ECX,
};
#ifdef CONFIG_X86_FEATURE_NAMES
@@ -48,28 +49,42 @@ extern const char * const x86_bug_flags[NBUGINTS*32];
test_bit(bit, (unsigned long *)((c)->x86_capability))
#define REQUIRED_MASK_BIT_SET(bit) \
- ( (((bit)>>5)==0 && (1UL<<((bit)&31) & REQUIRED_MASK0)) || \
- (((bit)>>5)==1 && (1UL<<((bit)&31) & REQUIRED_MASK1)) || \
- (((bit)>>5)==2 && (1UL<<((bit)&31) & REQUIRED_MASK2)) || \
- (((bit)>>5)==3 && (1UL<<((bit)&31) & REQUIRED_MASK3)) || \
- (((bit)>>5)==4 && (1UL<<((bit)&31) & REQUIRED_MASK4)) || \
- (((bit)>>5)==5 && (1UL<<((bit)&31) & REQUIRED_MASK5)) || \
- (((bit)>>5)==6 && (1UL<<((bit)&31) & REQUIRED_MASK6)) || \
- (((bit)>>5)==7 && (1UL<<((bit)&31) & REQUIRED_MASK7)) || \
- (((bit)>>5)==8 && (1UL<<((bit)&31) & REQUIRED_MASK8)) || \
- (((bit)>>5)==9 && (1UL<<((bit)&31) & REQUIRED_MASK9)) )
+ ( (((bit)>>5)==0 && (1UL<<((bit)&31) & REQUIRED_MASK0 )) || \
+ (((bit)>>5)==1 && (1UL<<((bit)&31) & REQUIRED_MASK1 )) || \
+ (((bit)>>5)==2 && (1UL<<((bit)&31) & REQUIRED_MASK2 )) || \
+ (((bit)>>5)==3 && (1UL<<((bit)&31) & REQUIRED_MASK3 )) || \
+ (((bit)>>5)==4 && (1UL<<((bit)&31) & REQUIRED_MASK4 )) || \
+ (((bit)>>5)==5 && (1UL<<((bit)&31) & REQUIRED_MASK5 )) || \
+ (((bit)>>5)==6 && (1UL<<((bit)&31) & REQUIRED_MASK6 )) || \
+ (((bit)>>5)==7 && (1UL<<((bit)&31) & REQUIRED_MASK7 )) || \
+ (((bit)>>5)==8 && (1UL<<((bit)&31) & REQUIRED_MASK8 )) || \
+ (((bit)>>5)==9 && (1UL<<((bit)&31) & REQUIRED_MASK9 )) || \
+ (((bit)>>5)==10 && (1UL<<((bit)&31) & REQUIRED_MASK10)) || \
+ (((bit)>>5)==11 && (1UL<<((bit)&31) & REQUIRED_MASK11)) || \
+ (((bit)>>5)==12 && (1UL<<((bit)&31) & REQUIRED_MASK12)) || \
+ (((bit)>>5)==13 && (1UL<<((bit)&31) & REQUIRED_MASK13)) || \
+ (((bit)>>5)==13 && (1UL<<((bit)&31) & REQUIRED_MASK14)) || \
+ (((bit)>>5)==13 && (1UL<<((bit)&31) & REQUIRED_MASK15)) || \
+ (((bit)>>5)==14 && (1UL<<((bit)&31) & REQUIRED_MASK16)) )
#define DISABLED_MASK_BIT_SET(bit) \
- ( (((bit)>>5)==0 && (1UL<<((bit)&31) & DISABLED_MASK0)) || \
- (((bit)>>5)==1 && (1UL<<((bit)&31) & DISABLED_MASK1)) || \
- (((bit)>>5)==2 && (1UL<<((bit)&31) & DISABLED_MASK2)) || \
- (((bit)>>5)==3 && (1UL<<((bit)&31) & DISABLED_MASK3)) || \
- (((bit)>>5)==4 && (1UL<<((bit)&31) & DISABLED_MASK4)) || \
- (((bit)>>5)==5 && (1UL<<((bit)&31) & DISABLED_MASK5)) || \
- (((bit)>>5)==6 && (1UL<<((bit)&31) & DISABLED_MASK6)) || \
- (((bit)>>5)==7 && (1UL<<((bit)&31) & DISABLED_MASK7)) || \
- (((bit)>>5)==8 && (1UL<<((bit)&31) & DISABLED_MASK8)) || \
- (((bit)>>5)==9 && (1UL<<((bit)&31) & DISABLED_MASK9)) )
+ ( (((bit)>>5)==0 && (1UL<<((bit)&31) & DISABLED_MASK0 )) || \
+ (((bit)>>5)==1 && (1UL<<((bit)&31) & DISABLED_MASK1 )) || \
+ (((bit)>>5)==2 && (1UL<<((bit)&31) & DISABLED_MASK2 )) || \
+ (((bit)>>5)==3 && (1UL<<((bit)&31) & DISABLED_MASK3 )) || \
+ (((bit)>>5)==4 && (1UL<<((bit)&31) & DISABLED_MASK4 )) || \
+ (((bit)>>5)==5 && (1UL<<((bit)&31) & DISABLED_MASK5 )) || \
+ (((bit)>>5)==6 && (1UL<<((bit)&31) & DISABLED_MASK6 )) || \
+ (((bit)>>5)==7 && (1UL<<((bit)&31) & DISABLED_MASK7 )) || \
+ (((bit)>>5)==8 && (1UL<<((bit)&31) & DISABLED_MASK8 )) || \
+ (((bit)>>5)==9 && (1UL<<((bit)&31) & DISABLED_MASK9 )) || \
+ (((bit)>>5)==10 && (1UL<<((bit)&31) & DISABLED_MASK10)) || \
+ (((bit)>>5)==11 && (1UL<<((bit)&31) & DISABLED_MASK11)) || \
+ (((bit)>>5)==12 && (1UL<<((bit)&31) & DISABLED_MASK12)) || \
+ (((bit)>>5)==13 && (1UL<<((bit)&31) & DISABLED_MASK13)) || \
+ (((bit)>>5)==13 && (1UL<<((bit)&31) & DISABLED_MASK14)) || \
+ (((bit)>>5)==13 && (1UL<<((bit)&31) & DISABLED_MASK15)) || \
+ (((bit)>>5)==14 && (1UL<<((bit)&31) & DISABLED_MASK16)) )
#define cpu_has(c, bit) \
(__builtin_constant_p(bit) && REQUIRED_MASK_BIT_SET(bit) ? 1 : \
@@ -79,6 +94,10 @@ extern const char * const x86_bug_flags[NBUGINTS*32];
(__builtin_constant_p(bit) && REQUIRED_MASK_BIT_SET(bit) ? 1 : \
x86_this_cpu_test_bit(bit, (unsigned long *)&cpu_info.x86_capability))
+/* Intel-defined CPU features, CPUID level 0x00000007:0 (ecx), word 16 */
+#define X86_FEATURE_PKU (16*32+ 3) /* Protection Keys for Userspace */
+#define X86_FEATURE_OSPKE (16*32+ 4) /* OS Protection Keys Enable */
+
/*
* This macro is for detection of features which need kernel
* infrastructure to be used. It may *not* directly test the CPU
diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h
index 0ceb6ad..cbb2c56 100644
--- a/arch/x86/include/asm/cpufeatures.h
+++ b/arch/x86/include/asm/cpufeatures.h
@@ -12,7 +12,7 @@
/*
* Defines x86 CPU feature bits
*/
-#define NCAPINTS 16 /* N 32-bit words worth of info */
+#define NCAPINTS 17 /* N 32-bit words worth of info */
#define NBUGINTS 1 /* N 32-bit bug flags */
/*
diff --git a/arch/x86/include/asm/disabled-features.h b/arch/x86/include/asm/disabled-features.h
index f226df0..39343be 100644
--- a/arch/x86/include/asm/disabled-features.h
+++ b/arch/x86/include/asm/disabled-features.h
@@ -28,6 +28,14 @@
# define DISABLE_CENTAUR_MCR 0
#endif /* CONFIG_X86_64 */
+#ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
+# define DISABLE_PKU (1<<(X86_FEATURE_PKU))
+# define DISABLE_OSPKE (1<<(X86_FEATURE_OSPKE))
+#else
+# define DISABLE_PKU 0
+# define DISABLE_OSPKE 0
+#endif /* CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS */
+
/*
* Make sure to add features to the correct mask
*/
@@ -41,5 +49,12 @@
#define DISABLED_MASK7 0
#define DISABLED_MASK8 0
#define DISABLED_MASK9 (DISABLE_MPX)
+#define DISABLED_MASK10 0
+#define DISABLED_MASK11 0
+#define DISABLED_MASK12 0
+#define DISABLED_MASK13 0
+#define DISABLED_MASK14 0
+#define DISABLED_MASK15 0
+#define DISABLED_MASK16 (DISABLE_PKU|DISABLE_OSPKE)
#endif /* _ASM_X86_DISABLED_FEATURES_H */
diff --git a/arch/x86/include/asm/required-features.h b/arch/x86/include/asm/required-features.h
index 5c6e4fb..4916144 100644
--- a/arch/x86/include/asm/required-features.h
+++ b/arch/x86/include/asm/required-features.h
@@ -92,5 +92,12 @@
#define REQUIRED_MASK7 0
#define REQUIRED_MASK8 0
#define REQUIRED_MASK9 0
+#define REQUIRED_MASK10 0
+#define REQUIRED_MASK11 0
+#define REQUIRED_MASK12 0
+#define REQUIRED_MASK13 0
+#define REQUIRED_MASK14 0
+#define REQUIRED_MASK15 0
+#define REQUIRED_MASK16 0
#endif /* _ASM_X86_REQUIRED_FEATURES_H */
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index f4bb2c4..a719ad7 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -627,6 +627,7 @@ void get_cpu_cap(struct cpuinfo_x86 *c)
c->x86_capability[CPUID_7_0_EBX] = ebx;
c->x86_capability[CPUID_6_EAX] = cpuid_eax(0x00000006);
+ c->x86_capability[CPUID_7_ECX] = ecx;
}
/* Extended state features: level 0x0000000d */
next prev parent reply other threads:[~2016-02-18 20:18 UTC|newest]
Thread overview: 84+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-12 21:01 [PATCH 00/33] x86: Memory Protection Keys (v10) Dave Hansen
2016-02-12 21:01 ` [PATCH 01/33] mm: introduce get_user_pages_remote() Dave Hansen
2016-02-15 6:09 ` Balbir Singh
2016-02-15 16:29 ` Dave Hansen
2016-02-15 6:14 ` Srikar Dronamraju
2016-02-16 12:14 ` [tip:x86/pkeys] mm/gup: Introduce get_user_pages_remote() tip-bot for Dave Hansen
2016-02-20 6:25 ` Konstantin Khlebnikov
2016-02-12 21:01 ` [PATCH 02/33] mm: overload get_user_pages() functions Dave Hansen
2016-02-16 8:36 ` Ingo Molnar
2016-02-17 18:15 ` Dave Hansen
2016-02-18 20:15 ` [tip:mm/pkeys] mm/gup: Overload " tip-bot for Dave Hansen
2016-02-12 21:01 ` [PATCH 03/33] mm, gup: switch callers of get_user_pages() to not pass tsk/mm Dave Hansen
2016-02-18 20:16 ` [tip:mm/pkeys] mm/gup: Switch all " tip-bot for Dave Hansen
2016-02-12 21:01 ` [PATCH 04/33] x86, fpu: add placeholder for Processor Trace XSAVE state Dave Hansen
2016-02-18 20:16 ` [tip:mm/pkeys] x86/fpu: Add placeholder for 'Processor Trace' " tip-bot for Dave Hansen
2016-02-12 21:02 ` [PATCH 05/33] x86, pkeys: Add Kconfig option Dave Hansen
2016-02-18 20:16 ` [tip:mm/pkeys] x86/mm/pkeys: " tip-bot for Dave Hansen
2016-02-19 11:27 ` [PATCH] x86/mm/pkeys: Do not enable them by default Borislav Petkov
2016-02-19 17:11 ` Dave Hansen
2016-02-19 17:23 ` Borislav Petkov
2016-02-19 17:49 ` Dave Hansen
2016-02-19 18:31 ` Borislav Petkov
2016-02-12 21:02 ` [PATCH 06/33] x86, pkeys: cpuid bit definition Dave Hansen
2016-02-18 20:17 ` tip-bot for Dave Hansen [this message]
2016-02-12 21:02 ` [PATCH 07/33] x86, pkeys: define new CR4 bit Dave Hansen
2016-02-18 20:17 ` [tip:mm/pkeys] x86/cpu, x86/mm/pkeys: Define " tip-bot for Dave Hansen
2016-02-12 21:02 ` [PATCH 08/33] x86, pkeys: add PKRU xsave fields and data structure(s) Dave Hansen
2016-02-18 20:17 ` [tip:mm/pkeys] x86/fpu, x86/mm/pkeys: Add PKRU xsave fields and data structures tip-bot for Dave Hansen
2016-02-12 21:02 ` [PATCH 09/33] x86, pkeys: PTE bits for storing protection key Dave Hansen
2016-02-18 20:18 ` [tip:mm/pkeys] x86/mm/pkeys: Add " tip-bot for Dave Hansen
2016-02-12 21:02 ` [PATCH 10/33] x86, pkeys: new page fault error code bit: PF_PK Dave Hansen
2016-02-18 20:18 ` [tip:mm/pkeys] x86/mm/pkeys: Add new 'PF_PK' page fault error code bit tip-bot for Dave Hansen
2016-02-12 21:02 ` [PATCH 11/33] x86, pkeys: store protection in high VMA flags Dave Hansen
2016-02-18 20:19 ` [tip:mm/pkeys] mm/core, x86/mm/pkeys: Store protection bits " tip-bot for Dave Hansen
2016-02-12 21:02 ` [PATCH 12/33] x86, pkeys: arch-specific protection bits Dave Hansen
2016-02-18 20:19 ` [tip:mm/pkeys] x86/mm/pkeys: Add arch-specific VMA " tip-bot for Dave Hansen
2016-02-12 21:02 ` [PATCH 13/33] x86, pkeys: pass VMA down in to fault signal generation code Dave Hansen
2016-02-18 20:19 ` [tip:mm/pkeys] x86/mm/pkeys: Pass " tip-bot for Dave Hansen
2016-02-12 21:02 ` [PATCH 14/33] signals, pkeys: notify userspace about protection key faults Dave Hansen
2016-02-18 20:20 ` [tip:mm/pkeys] signals, pkeys: Notify " tip-bot for Dave Hansen
2016-02-12 21:02 ` [PATCH 15/33] x86, pkeys: fill in pkey field in siginfo Dave Hansen
2016-02-18 20:20 ` [tip:mm/pkeys] x86/mm/pkeys: Fill " tip-bot for Dave Hansen
2016-02-12 21:02 ` [PATCH 16/33] x86, pkeys: add functions to fetch PKRU Dave Hansen
2016-02-18 20:21 ` [tip:mm/pkeys] x86/mm/pkeys: Add " tip-bot for Dave Hansen
2016-02-12 21:02 ` [PATCH 17/33] mm: factor out VMA fault permission checking Dave Hansen
2016-02-18 20:21 ` [tip:mm/pkeys] mm/gup: Factor " tip-bot for Dave Hansen
2016-02-12 21:02 ` [PATCH 18/33] x86, mm: simplify get_user_pages() PTE bit handling Dave Hansen
2016-02-18 20:21 ` [tip:mm/pkeys] x86/mm/gup: Simplify " tip-bot for Dave Hansen
2016-02-12 21:02 ` [PATCH 19/33] x86, pkeys: check VMAs and PTEs for protection keys Dave Hansen
2016-02-18 20:22 ` [tip:mm/pkeys] mm/gup, x86/mm/pkeys: Check " tip-bot for Dave Hansen
2016-02-12 21:02 ` [PATCH 20/33] mm: do not enforce PKEY permissions on "foreign" mm access Dave Hansen
2016-02-12 21:02 ` [PATCH 21/33] x86, pkeys: optimize fault handling in access_error() Dave Hansen
2016-02-18 20:23 ` [tip:mm/pkeys] x86/mm/pkeys: Optimize " tip-bot for Dave Hansen
2016-02-12 21:02 ` [PATCH 22/33] x86, pkeys: differentiate instruction fetches Dave Hansen
2016-02-18 20:23 ` [tip:mm/pkeys] mm/core, x86/mm/pkeys: Differentiate " tip-bot for Dave Hansen
2016-02-12 21:02 ` [PATCH 23/33] x86, pkeys: dump PKRU with other kernel registers Dave Hansen
2016-02-18 20:24 ` [tip:mm/pkeys] x86/mm/pkeys: Dump " tip-bot for Dave Hansen
2016-02-12 21:02 ` [PATCH 24/33] x86, pkeys: dump pkey from VMA in /proc/pid/smaps Dave Hansen
2016-02-18 20:24 ` [tip:mm/pkeys] x86/mm/pkeys: Dump pkey from VMA in /proc/pid/ smaps tip-bot for Dave Hansen
2016-02-12 21:02 ` [PATCH 25/33] x86, pkeys: add Kconfig prompt to existing config option Dave Hansen
2016-02-18 20:24 ` [tip:mm/pkeys] x86/mm/pkeys: Add " tip-bot for Dave Hansen
2016-02-12 21:02 ` [PATCH 26/33] x86, pkeys: actually enable Memory Protection Keys in CPU Dave Hansen
2016-02-18 20:25 ` [tip:mm/pkeys] x86/mm/pkeys: Actually enable Memory Protection Keys in the CPU tip-bot for Dave Hansen
2016-02-12 21:02 ` [PATCH 27/33] mm, multi-arch: pass a protection key in to calc_vm_flag_bits() Dave Hansen
2016-02-18 20:25 ` [tip:mm/pkeys] mm/core, arch, powerpc: Pass " tip-bot for Dave Hansen
2016-02-12 21:02 ` [PATCH 28/33] x86, pkeys: add arch_validate_pkey() Dave Hansen
2016-02-18 20:25 ` [tip:mm/pkeys] mm/core, x86/mm/pkeys: Add arch_validate_pkey() tip-bot for Dave Hansen
2016-02-12 21:02 ` [PATCH 29/33] x86: separate out LDT init from context init Dave Hansen
2016-02-18 20:26 ` [tip:mm/pkeys] x86/mm: Factor " tip-bot for Dave Hansen
2016-02-12 21:02 ` [PATCH 30/33] x86, fpu: allow setting of XSAVE state Dave Hansen
2016-02-18 20:26 ` [tip:mm/pkeys] x86/fpu: Allow " tip-bot for Dave Hansen
2016-02-12 21:02 ` [PATCH 31/33] x86, pkeys: allow kernel to modify user pkey rights register Dave Hansen
2016-02-18 20:27 ` [tip:mm/pkeys] x86/mm/pkeys: Allow " tip-bot for Dave Hansen
2016-02-12 21:02 ` [PATCH 32/33] x86, pkeys: create an x86 arch_calc_vm_prot_bits() for VMA flags Dave Hansen
2016-02-18 20:27 ` [tip:mm/pkeys] x86/mm/pkeys: Create an x86 arch_calc_vm_prot_bits () " tip-bot for Dave Hansen
2016-02-12 21:02 ` [PATCH 33/33] x86, pkeys: execute-only support Dave Hansen
2016-02-17 21:27 ` Kees Cook
2016-02-17 21:33 ` Dave Hansen
2016-02-17 21:36 ` Kees Cook
2016-02-17 22:17 ` Andy Lutomirski
2016-02-17 22:53 ` Dave Hansen
2016-02-18 0:46 ` Andy Lutomirski
2016-02-18 20:27 ` [tip:mm/pkeys] mm/core, x86/mm/pkeys: Add execute-only protection keys support tip-bot for Dave Hansen
2016-02-16 9:29 ` [PATCH 00/33] x86: Memory Protection Keys (v10) Ingo Molnar
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